Firms paid to shut down wind farms when the wind is blowing - Telegraph
Pumped-storage hydroelectricity - Wikipedia, the free encyclopediaThe electricity cannot be stored, so one solution known as the 'balancing mechanism' is to switch off or reduce the power supplied.
There's always SOMETHING you can do with it, and a nice head of water is an excellent storage medium.
Plus, hydro can go from zero to peak output and back to zero in the time it takes to turn a tap.
Failing that, ALL spare capacity should be shunted into the electrolysis plants cracking water into hydrogen (which can be stored and then 'burned' to release energy on demand).